New branding, same pathethic service. Do not use metrofibre, can't even upgrade seamlessly

I was contacted on the 19th April by a Metrofibre technician who indicated that I need to upgrade my router for a new Nokia wifi6 router. I asked about the benefits and it seemed good. I also asked him, how long will this take to be done because I work from home and so does my wife. He indicated 45mins. I told him lets go ahead and do it. He came through at 3pm. Was done at 3:10pm and told me all should be well. If I can't connect then I must contact metrofibre support and ask for Nok department. Well I tried and could not connect. Call Metrofibre, they have been telling me to wait 2 hrs, then 4 hrs. It has been ongoing. Its now almost 40 hours and my service is not working. I had to go into the office for these 2 days, my wife has had to make alternate arrangements. Metrofibre is no closer to solving the issue. REMEMBER this is just an upgrade. I had no issue to my line. I have asked for the Support Manager to contact me and im still waiting. I also requested that they remove that new router and revert my installation to what it was and still no response from Metrofibre. I am at a stage of dropping their service completely due to their incompetence.